The Ultimate Solar System Quiz

This is a very well-known fact, though before 2006, there were 9 planets. The discovery of dwarf planet Eris led to the creation of that category and the demotion of Pluto.

Explained in the reasoning for the above answer.

Charon and Pluto actually orbit each other in what is called a “double planet system.” (Changed from “size” to “diameter” because of XYU pointing out “size” indicates “volume” more than “diameter.” Thanks, XYU!

Jupiter is so much larger than any other planet, in both diameter and volume, that they can all fit in it!

A simple question, self-explanatory.

Vesta is currently considered an asteroid, though it is a candidate for dwarf planet status.

For instance: Titania, Oberon, Miranda, Prospero, and Puck

At aphelion, The Goblin is more than 2,000 AU from the Sun!

When Ceres was first discovered, it was called a planet. However, other discoveries pushed it to asteroid status. It is now classified as a dwarf planet.

Hence the term “Sednoid” for objects with long orbits, rather than “Leleakuhonuoid.”

Haumea is the Hawaiian goddes of childbirth and fertility.

Pluto has five moons. Earth and Mars have a combined 3.

It used to be 3, but the Great Red Spot has slowly been shrinking.

This is based on volume, not mass. Because Earth’s radius is so much smaller, more than a thousand can fit in Jupiter, and thus more than a million in the Sun.

Discovered when Voyager 2 passed Neptune, the spot vanished in 2022.

The thick layers of clouds induce a massive greenhouse effect. You could cook your eggs in seconds on the surface of Venus!

Uranus is around 1.8 billion miles away from the Sun, while Neptune is around 2.7 billion, a difference of 900 million miles, or half the distance from Uranus to the Sun farther.

Much research has been done on this topic. The water people drink has been proven to be hundreds of millions of years old!

According to a study from an Arizona State University researcher, around four billion years ago, Neptune and Uranus swapped places.